What are the pests when planting corn?

What are the pests when planting corn? There are many pests in the life of corn, and there are as many as 35 kinds of research reports at present, but the production is often occurring and the damage is more serious, mainly including fall armyworm, corn borer, thrips, aphids, underground pests, Spodoptera exigua, armyworm and other pests. At present, the prevention and control of corn pests is mainly based on chemical control, timely physical control and biological control, etc., which can effectively prevent the occurrence of pest damage.

At present, the common and better chemical agents in production are, fall armyworm is selected with 60 ml of 5% lice mite urea per mu, which has a good control effect on eggs and larvae, and can also be sprayed with 50 ml of 15% emamectin salt fenfenapyr per mu or 15 ml of 20% chlorantraniliprole in the peak period of young larvae. Corn borer is generally used in the bell mouth period with 3-4 catties of 5% chlorpyrifos or 3% phosphine granules to lose their hearts for control, and more than 50 larvae of 100 larvae can be sprayed with 50-70 ml of emamectin salt, or 30 ml of 5% high chlorine spray control.

When armyworm occurs, the agent used to control fall armyworm is used for control, and the effect is also better. For corn aphids, 3-4 grams of 70% imidacloprid per mu, or 16-20 grams of 50% pymetrozine per mu, and thrips in addition to spraying imidacloprid control, can generally use 50-60 ml of 50% dimethoate per mu, which has a good effect on aphid mites. For Spodoptera exigua, 10% cyhalothrin microcapsules can be sprayed, which can not only trap and kill pests in the soil, but also spray pesticides on the soil surface and kill insects under the soil.

In addition, before corn sowing, the selection of phosphine, or chlorpyrifos or fipronil and other agents for seed dressing, underground pests, thrips, aphids, Spodoptera exigua, etc. have a good culling and control effect, and fall armyworm with deltatraniliprole thiamethoxam seed dressing effect is the best. In short, there are many types of corn pests, and there are many control methods, which should be scientifically controlled according to the local pest occurrence species and control methods.

Corn aphids, thrips, corn borers, corn bollworms, corn armyworms, Spodoptera litura, these are all pests that occur during corn planting.

There are pests and diseases of scab, powdery mildew, rust, wilt and sheath blight. And these insect pests have a great impact on corn.

Corn aphids, corn borers, thrips, noctuidae excidaes, underground pests, these are the more common insect pests.

<> disease occurs in the whole process of corn growth and development, the seedling stage appears from the base of the heart leaf green spotted flower leaves, gradually extends to the whole leaf, the mesophyll loses green and turns yellow, forming obvious yellow-green stripes, the disease is serious, the diseased plant dies, and the corn can not be headed.

Control methods: Choose disease-resistant varieties for planting, and use early pesticides to eliminate aphids and planthoppers before migrating to corn fields. It can be sprayed with 40% oxidized happy fruit 3000 times liquid or 50% anti-aphid wettable powder, which can play a good role in control.

Corn roughness disease. Corn roughness disease generally does not occur in the whole field, and there are many diseased plants in places with many weeds such as roadsides and ditches. The occurrence of corn roughness disease is caused by the poisoning of gray planthoppers, once it is poisonous, lifelong poison, persistent poisoning, corn can be harmed when one leaf is one heart, the earlier the corn is damaged, the more serious the corn damage, 5-6 leaves begin to show symptoms, and once the symptoms are manifested, there is basically no cure.

10% imidacloprid wettable powder 20 g, % cyanocyanide or cyhalothrin 25 ml, 48% chlorpyrifos EC 25 ml, 25% parametrix EC 30 ml, % avermectin 25 ml, control the number of planthoppers. Or spray pesticides and insects before and after sowing near the emergence of seedlings, spray 10 imidacloprid 30 grams per mu plus 100 ml of 5 bacterial poison clear, both insecticide, spray again every 5 days, and use 2 times 3 times in a row to control the disease.

People get sick, and crops get sick. Once crops become "sick", it will cause reduced yields, reduced quality, and even no harvest. Today, I will introduce the more common corn diseases, hoping to help farmers prevent them.

Symptoms: The ear infection is infected from the tip of the ear downward, the ear grains are coal-stained, and there is a black mold layer on the surface of the grains and between the grains. The diseased grains are dry rot, and the grains are powdered by twisting them by hand.

Yellow leaf disease, yellow stem disease, rotten fruit disease, this kind of disease will have a lot of damage to corn, and the problem is also very big, especially terrible.

Prone to corn spot, corn root rot, corn spot, corn thrips, corn armyworm disease, corn powdery mildew, corn borer disease, and so on.

Corn large spot disease.

Corn large spot disease, also known as stripe disease, coal streak disease, leaf blight disease, leaf spot disease, etc., is the main leaf disease of corn, which occurs in all parts of China, and the damage is serious. It mainly harms leaves, and can also harm leaf sheaths and bracts in severe cases. Generally, it starts from the bottom leaf and gradually expands upward, and in severe cases, it can spread throughout the whole plant, but there are also cases of disease from the middle and upper leaves.

Large nucleated lesions are formed on the infected leaves, which are water-stained blue-gray or gray-green small spots at the beginning of the field, and after expansion, they are dark brown, light brown or gray diamond-shaped or long spindle-shaped large spots at the edges, generally 5-10 cm long, and there is an obvious black-brown mold layer on the lesions when wet, and the lesions are combined with longitudinal cracks when the lesions are severe, and the leaves die.

The main diseases at the seedling stage of maize are cataplexy, seedling blight and root rot caused by Pythium and Fusarium beads. For the prevention and treatment of cataplexy, you can use 10% Shileshi water solution or 5% Genbao 50 100ml mixed with 50 kg of corn seeds; When the seedlings are found wilted or wilted, 500 800 times of Pulik water solution, 500 times of 58% Redomir manganese zinc wettable powder or 600 times of 72% Kelu wettable powder can be sprayed. To prevent and control seedling blight, you can use 100 grams of 50% phosphine plus 2 kg of water to mix 50 kg of corn, stack for 4 6 hours, dry slightly and mix 100 grams of 50% carbendazim for sowing; It can also be controlled with 10% aphid lice plus cypermethrin plus 70% methyl tobuzin 800 times.

To prevent and control viral diseases, in the early stage of the disease, spray with a mixture of 20% virus buster 500 times liquid and green leaf treasure 400 500 times liquid to have a certain effect, and at the same time use 50% aphid fog wettable powder 2500 times liquid spray to prevent and control aphids and gray planthoppers and other poisonous pests.

In addition, for the prevention and control of large spot disease, spray with 600 times of 40% gram blast powder or 70% mancozeb wettable powder. For the prevention and treatment of small spot disease, spray with 50% carbendazim wettable powder 500 times or 70% methyl tobuzin wettable powder 500 times. Foliar spraying of zinc sulfate at the 4 5 leaf stage of maize can prevent and control zinc deficiency and enhance plant disease resistance.

<> corn pests mainly include borers, mole crickets, grubs, ground tigers, aphids, etc., corn borer can be sprayed with 1000-1500 times of 1000 grams of 1000 grams, and 2000 times of liquid can be used to irrigate roots with 2000 times of shaking crickets; The control of grubs can be used to irrigate the roots with 1500 times the solution of 1,000 grams of insects; The control of aphids can be sprayed with 2000 times the liquid of Youlede; Use rice bran, peanut bran or bean cake to crush and fry fragrant and mix 5% trichlorfon for local tigers to eat, and the control effect is obvious.

1. What are the main corn pests?

1. Corn borer, also known as borerworm, often burrows into the young stems and leaves to bite, damaging the stem and leaf tissues, so that nutrients and water can not be transported, affecting the growth of corn.

2. Adult mole crickets and nymphs bite off corn seedlings near the surface, endangering the normal growth of corn, and also digging channels on the surface of the soil to bite off the taproot of seedlings, resulting in the death of corn seedlings.

3. The grub bites off the plant seedlings and rhizomes, causing the corn seedlings to wither and die.

4. The ground tiger is generally hidden under the soil surface during the day, and when the dew is more than dawn, it will bite off the corn stalk at 3-4 cm from the ground, and then pull it to the hole to feed.

5. Aphids, also known as cotton aphids, adult aphids suck the juice on the back of corn leaves and tender stems, and the leaves of the affected melon plants shrink, causing the melon seedlings to wilt and even die.

2. How to control corn pests

1. Use 2000 times of Mobilang, 1000-1500 times of 1000-1500 times of Qianjig, and 1000 times of Golden Century to fill or spray corn borer.

2. Mole crickets can be used for root irrigation and control with 1500 times of 1,500 grams of lichen, 2,000 times of jitter and 800 times of trichlorfon.

3. Use 2000 times of Shake, 800 times of Trichlorfon, and 1500 times of 1500 times of 1000 grams of insects to irrigate the roots, and the effect of grub control is better.

4. The prevention and control of ground tigers can be used with rice bran, peanut bran or soybean cake to crush and fry 5% trichlorfon, disperse 10 piles per mu at dusk, half a catty per pile, cover with fresh and tender grass, and the ground tiger can be killed after eating, and the control effect is good and fast.

5. You can choose 2000 times of Youlede, 7500-10000 times of Actay, 2000 times of imidacloprid, 1000-1500 times of Qianfenke, and 1500-2000 times of Golden Century to spray and control aphids, and the control effect is remarkable.